Spatial Analysis in Government Lecture 2- Data &amp; Information. By Guy Thigpen, M.Phil., MUSA. Purpose of Lecture. Review the Data and Information contained in GEODB2 Explore an example (ULRS) of the information available in the data warehouse Examine the data structure of a parcel layer.

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CachingOne of the main characteristics that makes the server very capable of publishing maps over web is Caching. Additionally, we have more control over how the cache gets built and updated. Caching particular areas on the map and On Demand caching are the other main features.

SecurityManagement of services with ArcGIS Server's role based security has been a major advantage. Also, the product supports token based security for web services and applications.

ImageryArcGIS Server 10.1's Imagery capabilities enable us to handle large amount of GIS data and provides access to it enterprise wide. It also allows processing and analysis of images on the client side.

Some of the services that we provide include, City Aerial Photography, City Hybrid Map, Parcel Layer, Building Footprint Layer, Septa Lines etc.

All these services can be overlaid upon each other according to the user's choice in any web application or desktop around the city.

RESOLUTION:Pictometry offers two levels of resolution, “community” level and “neighborhood” level. The average resolution of oblique imagery at community level (shot from around 4,500 ft) is 1-foot per pixel, and at neighborhood level (shot from around 3,500 ft) is 4-inch per pixel.

DATE/ TIME STAMP : Each image is date and time stamped with the time of capture as reported by the time information transmitted from the Global Positioning System.

CAPTURE AREA:

The oblique imagery is captured for the City of Philadelphia, including

center city area,

the entire Philadelphia International Airport, which is located in Delaware County, and

the Wyndmoor portion of Montgomery County.

With Pictometry Electronic Field Study (EFS) software, licensed users are allowed to view and work with the aerial images contained in the Pictometry Image Library

The easiest way to create a connection to the central data warehouse, is by using ArcCatalog and connect to the ArcSDE application server (aka. Geodb2). Geodb2 will broker all your operations to the database.

2) Connecting with Oracle Client:

The central warehouse is in essence an Oracle database, and for power users out there who perform more complex operations and queries, you can connect to the warehouse directly using any Oracle Client .

GIS Spatial Data Sharing and Distribution

In general the staff and departments who have been in the forefront of the development of the City’s spatial data support the sharing of this data within the City and to the public where appropriate and where the City’s costs to provide this data access can be reimbursed.

The interns at the Philadelphia redevelopment Authority are also provided access to the database.

Bring together the GIS users in all the departments of City of Philadelphia.

The topics discussed here are expected to get attention from the concerned users who may make posts pertaining to the discussion.

Threads can serve as future reference for various issues should the need arise.

Group structure with restrictions:

Threads in the forum pertaining to certain specific topics will be having access limitations; consequently, the forum users will be divided into groups according to the topics that are discussed and these groups will be having access those threads. One user can be present in multiple groups depending on the topics he is engaged in. Another one will be the read only restriction for certain threads and for certain users.

Solutions can be found soon without numerous email tags and phone call exchanges as the problems are viewed by the community.

Betterment in speed, resource utilization and problem-solving of city-wide GIS analysis and development.

Replaces the ULRS Explorer – which was discontinued after June 30, 2009.

Why the rename?

address is central – not the parcel, not the BRT#,…

also, underline the fact that ULRS does not store any other information other than relationships between addresses & parcels on the one hand, and addresses & accounts on the other hand. (nothing more, nothing less)

Mimic three basic ways of retrieving information from the web services

1: First it gives the rotation of the line with respect to the geographical north in degrees, minutes and seconds. It is in the middle part between the directions.

2: Second it gives the direction of the line from the starting point to the end point in one of the four predefined ways - South to East, South to West or North to East, North to West. These directions are at the start & end.